线路上发生接地故障时，故障点零序电压幅值（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500192 and id<>'4500192' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500192 and id<>'4500192' order by id asc limit 5